Stoker construction



March l2, 1935. R. l., BEI-:Rs

STOKER CONSTRUCTION Filed Feb. 19, 1934 2 Sheets-Sheet l ATroRNEYs March 12,v 1935. R. L. BEERS -1,993,819

. STOKER CONSTRUCTION Filed Feb. 19, 1934 2 sheets-sheet 2 INVENTOR ATTO FfNEY/SY Patented Mar. 12, 1935 sToKER ooNsTRuoTioN f Royce LQ Beers, '-Detroit,

ftroit Stoker Company, "Detroit, Mich.; a corporation of Michigan Application February 19, i934, Seiallo. .712,066 eclaims. (o1. 12s-'169) This vinvention relates generally to vgrate actuating means and refers more particularly to the means employed for lactuating the grates within a vfurnace orboler fired by afsuitable Stoker.

fHerctofore such vgrates have been mounted'for tilting movement. yand have rbeen vactuated from the front Yof the furnace by afshaking bar .suitably fconnected tothe grates Aand :extending through an'opening in the front wall of the furnace, and a rockerfmember pivotally connected to the'shakingbarat theouterforward end thereof and operable by a suitable hand lever. Inasmuch as .the actuator for lthe shaking bar was 'a rocker member :and Was pivotally connected thereto, the opening in the front -wall of the'furnac'e that -received the Yshaking v.bar had to be sufficiently large to permit' the shaking bar to lmove vertically as Well 4as 4longitudinally upon oscillation `rof the rocker'member. As la result, a large portion of the air fed into the furnace beneath the-.gratas escaped through Athis `opening vinstead of passing upwardly through the grates'and fuel bed-thereon tof'assist in the proper combustion of the fuel..4 u

Therefore, it is an'oloject of thefpresent invention to provide a` grate actuating means wherein fluid actuated means instead of the vrocker -mern-A berfandlever lis utilized forv actuating lthe shaking bar.y A

Another object is te provide a grate :actuating means wherein an element of the fluid actuated means restricted to longitudinal movement only is movable through the fro-nt Wall of the furnace and is operatively connected t0 the shaking bar for the grates.

Another` object is to provide a grate actuating means wherein the connection between the element of the fluid actuated means and shakingl bar is such that the shaking bar may move vertically and longitudinally while the element is moving longitudinally.

f Another object is to provide a grate actuating means wherein an enclosure for a part of the fluid actuated means serves to effectively close and seal the opening in the front wall of the furnace through which the fluid actuated element extends.

Other objects, advantages and novel details of construction of this invention will be made more apparent as'tlns description proceeds, especially when considered in connection with the accompanying drawings, wherein:

Figure 1 is a fragmentary vertical sectional View through a furnace containing tiltable gratos and showing the means embodying my invention for actuating said grates;

y Figurei2 isla sectionalview taken substantially on the :line 2-2r of Aliigure l;

Figure 3 is afragmentaryfront elevation of the cylinder, control valve @and associated pipes;

Figureiis a-topiplanviewof the cylinder, con- 5 trol valvewand. associated partswith portions broken aWayand-insection;

' Figure 5 is'aperspective'viewof the lever H and showing associatedjparts dotted lines.

yReferringenow to fthe drawings, A are the 1o grates, B is the shaking bar, and vC designates generally the means embodying lmy invention for actuating :the 'bar.B.

' As shown, 'the grates A are conventional in configuration and are located in a suitable fur- 15` nace 'between ythe combustion'zchamber D and ash pit iExthereof.. Preferably the 'grates A are nonrotatably 4molmted on bars F which in turn arel rotatably mounted ina suitablesupporting frame G. I-l arelevers `non-rotatably mounted on Athe 20 bars F -andppivotally connected :tofand carrying the shaking bar B. lIvhus, the levers H will tilt the,.grates A 4about the. axes of Ythe .bars F when the vbarlB is 'movedflongitudinally Preferably the'meansCforlmoving the shaking 25 bar `.13 :longitudinally comprises a reciprocating piston I Within a cylinder J upon the front wall YK ofthe furnace,-a lrod"Lrigidwith the `piston l2` and extendingthroughan opening Min the front wall K of thesfurnace, :and-a link .N terminally 30' of the cylinder and has a reduced cylindrical 40 portion 6 that extends throughthe opening M in the front wall K of the furnace and serves as a guide for the rod L. Preferably the anges 3 and 5 cover the opening M in the front wall K and f are secured to the outside metal plate R thereof 45 by the bolts 4. A gasket 7 is interposed between the flange 3 and plate R to effectively seal the opening M about the reduced portion 6 and thus prevent the escape at this point of air fed into the furnace beneath the grates A.

To prevent the escape about the rod L of the uid used in the cylinder J for actuating the piston I, suitable packing S is placed within a chamber 10 in the reduced portion 6 and is held 55 in operative position therein by a gland T secured by bolts U to the cylindrical portion 6.

In the present instance steam is preferably used as the fluid for actuating the piston I and is conducted from a suitable source by a pipe 11 to a four-way valve W. Pipes 12 and 13 respectively extend from the valve W to the openings 1 and 2 in the cylinder, while a pipe 14 extends from the valve and constitutes an exhaust line. The Valve W may be any suitable construction and may be operated by any suitable means. Preferably the valve has a rotary plug 16 provided with passages 17 for establishing communication with the pipes 11, V12, 13 and 14, as illustrated in Figure 4 and is operated by a suitable lever X.

In use when one passage 17 communicates with pipes 1l and 13, the other passage 17 will communicate with the pipes 12 and 14, hence the steam will enter the cylinder J at the forward end thereof and will move the piston I, rod L, link N and bar B rearwardly. As a result, the grates A will be rocked about the axes of the bars F to dumping position When one passage 17 communicates with pipes 11 and 12, the other passage 17 will communicate with pipes 13 and 14, hence steam will enter the cylinder J at the rear end thereof and will move the piston I, rod L, link Nl and bar B forwardly. As a result the grates A will be restored to their normal horizontal position.

Thus, from the foregoing it will be apparent that the grates A will be moved positively to and from dumping position. Inasmuch as the rod L is restricted to longitudinal movement only, the opening M in the front wall K of the furnace may be smaller as it is unnecessary to provide clearance at this point to compensate for any vertical movement as heretofore. Moreover, the link connection between the rod Land bar B permits the latter to move vertically as well as longitudinally. It will also be observed that the head P not only forms a guide for the rod L to restrict its movement, but also cooperates with the gasket 7 to effectively seal the opening M in the front wall of the furnace so that air fed into the ash pit E beneath thegrates will be prevented from escaping about the cylindrical portion 6 through the front Wall of the furnace.

What I claim as my invention is: 1. In a stoker, the combination with a stoker wall having an opening therethrough, a movable grate member on one side of the Wall, a cylinder upon the wall closing and sealing the wall opening, a piston within the cylinder and a connection between the piston and grate member.

2. In a Stoker, the combination with a Stoker Wall havingA an opening therethrough, of a movable grate bar within the Stoker, a fluidcylinder mounted `directly upon the wall and sealing the opening, a piston within the cylinder, its rod eX- tending through the opening, and a link connection between rod and grate bar.

3. In a stoker, the combination with a stoker wall having an opening extending therethrough, of a movable grate bar within the Stoker, a fluid cylinder mounted upon the exterior of the wall and sealing the wall opening, a tubular extension `upon the cylinder projecting through the openthe cylinder, apiston within'the cylinder, and an operative connection between piston and grate bar.

5. In a Stoker, the combination with a Stoker Wall having an opening extending therethrough, of a movable grate bar, a fluid cylinder equipped with fluid control valve mechanism mounted in its entirety upon the wall and sealing the opening therethrough, a piston Within the cylinder, and a rod for the piston connecting with the grate bar.

6. In a stoker, the combination with a Stoker wall having an opening extending therethrough, a plurality of rockable grate bars within the Stoker, a shakerbar for the several grate bars, a fluid cylinder mounted upon the exterior of the wall and sealing the said opening, a piston within the cylinder, its rod extendingthrough the wall opening, and a link connecting said rod with the shaker bar.

ROYCE L. BEERS. 

